Missing custom metrics

[szb640]

Expected behavior (what you expected to happen): Metrics appended via $METRICS_PATH should appear in prometheus results.

Actual behavior (what actually happened): From v1.4.2+, metrics are added successfully (confirmed by logs), however they are not returned by prometheus.

Steps to reproduce:

1. Add hook and deploy
2. Inside the container run curl 127.0.0.1:9115/metrics

Environment:

• Shell-operator version: v1.4.2+
• Kubernetes version: v1.27.7
• Installation type (kubectl apply, helm chart, etc.): Helm chart

Anything else we should know?: This is working as expected in ghcr.io/flant/shell-operator:v1.4.1, but seems broken in v1.4.2 and v1.4.3.

Additional information for debugging (if necessary):

Hook script

#!/usr/bin/env bash
source /shell_lib.sh
function config() {

cat <<EOF

configVersion: v1

onStartup: 1

EOF

}
function main() {

echo '{"name": "my_metric", "action": "add", "value": 0}' >> ${METRICS_PATH}

}
hook::run $@

Logs

{"level":"info","msg":"Create metric counter my_counter","operator.component":"metricStorage","time":"2023-11-20T00:00:00Z"}
{"binding":"","event":"onStartup","hook":"startup.sh","level":"info","msg":"Hook executed successfully","queue":"","task":"HookRun","time":"2023-11-21T14:38:12Z"}

[szb640]

I've found #549 introduced a breaking change in how metrics are reported, they are no longer exposed on /metrics path but on /metrics/hooks.